Ehh not some much. The attempted crushing of the Civil Rights movement by the then sectarian government of Northern Ireland and the subsequent esclation on all sides is much more "responsible" for the decades of troubles there than lingering memories of 800 years. If you found your street under attack by the police, homes burned out and forced to become a refugee (as was happening with State backing in NI in the late 60s) it's not so easy to dismiss it as "history"